Atron Compu 5000
The Atron Compu 5000 is a rather vintage scanner, that can be easily equipped with a discriminator output. This scanner uses a TA7130 FM IC. The baseband audio can be found on pin 7.
If you follow the trace from pin 7, you will find a resistor and capacitor connected to pin 7. You can follow the next steps to make a discriminator output:
Follow the trace from pin 7
The compontents for the discriminator output